This paper prescribes a movable voltage-variable and frequency-variable on-shore power supply system which successfully provides on-shore power for container vessel on port. The high voltage power supply (10 kV/50 Hz/2 000 kVA) for the quay cranes is used for the power input of the system, after frequency and voltage converting (450 V/60 Hz), then putting out and supplying to vessel. This system is flexible with positive effect on energy-saving and emission reduction; besides, there’s no requirement of civil reconstruction to container terminals, which is suitable for the busy ports in China. This high voltage power supply (10 kV / 50 Hz / 2 000 kVA) for the quay This system is flexible with positive effect on energy-saving and emission reduction; besides, there’s no requirement of civil reconstruction to container terminals, which is suitable for the busy ports in China.